Helical tube hot-extrusion die in porous magnesium alloy

Abstract

A helical tube hot-extrusion die in porous magnesium alloy belongs to the technical field of die processing. The helical tube hot-extrusion die comprises an upper die, a middle die and a lower die, wherein, the upper die, the middle die and the lower die are sequentially sheathed and are of disk structures, and rabbets, locating pins and bolts are respectively arranged between the upper die and the middle die as well as between the middle die and the lower die for fixation. A helical flow supply mode is adopted for the upper die of the helical tube hot-extrusion die, which significantly lowers resistance formed by helical shaping of tube blank by special helical equipment when a tubular product is extruded; and a circular welding cavity is adopted for the lower die, which is beneficial for rotary welding of a magnesium alloy material of plastic flow in the welding cavity. Meanwhile, dimensional accuracy of a metal is ensured under the action of a forming cavity working tape when the metal is extruded out of the welding cavity, and the die structure has good symmetry, thus reducing non-uniformity of feed stock flow, and avoiding cracking of tube walls when a helical aperture is formed on the magnesium alloy material. The helical tube hot-extrusion die has the advantages of high preparation and production efficiency, few waste materials, good quality and being more favorable for meeting the requirements of continuous production.

Description

technical field [0001] The invention relates to a device in the technical field of die processing, in particular to a hot extrusion die for a porous magnesium alloy inner spiral tube. Background technique [0002] With the expansion of production scale and the update of production technology, the research of heat exchanger technology must also meet the special and harsh requirements of various situations. Under the premise of meeting a certain amount of heat exchange, the heat exchanger is also developing in the direction of high efficiency and compactness. The spiral tube heat exchanger is a kind of high-efficiency and compact heat exchanger. With the increasing use of spiral tube heat exchangers, in order to meet the requirements of large-scale production and improve production efficiency, the technical requirements for one-time forming of spiral tubes have been put on the agenda. [0003] At present, aluminum alloy spiral tubes are generally used to process heat exchange...

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Problems solved by technology

However, there are some problems in this prior art, such as: the metal flows straight in the mold cavity, the strength is weak, and the material flow cannot be rotated, and the welding quality is poor; the extruded pipe has a welding seam, and the subsequent spiral twist Cracks are prone to appear inside, which directly affects the service life of the heat exchanger; the structure of the upper mold is complex, the processing is difficult, and the production cost is high; so it is not suitable for one-time extrusion of hollow pipes with internal spiral holes

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